I am making a shutter for my camera using a Arduino and an optocoupler.
I understand most of most parts, but unsure about the resistor because I don't have the correct size. 5V will be coming from the Arduino, and the 4N35 will need 1.3V 10mA. This leads to a 380Ω resistor.
Now I only have 100Ω, 220Ω, 330Ω, and 1kΩ resistors. I have read I shouldn't use anything lower than 380Ω and only use higher but 1kΩ seem a little too high haha.
Just looking for some pointers please.